private async void Instance_DeviceConnectionUpdated(bool isConnected, string error)
{
System.Diagnostics.Debug.WriteLine("Instance_DeviceConnectionUpdated : " + isConnected);
if (isConnected)
{
await this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
progressRing.Text = "Registering Background service";
System.Diagnostics.Debug.WriteLine("Device is now conneted, registering background task");
string retValue = BackgroundManager.RegisterBackgroundTask(BLEDeviceEngine.Instance.Characteristic);
SetWaitVisibility(false);
if (retValue != null)
{
ShowErrorDialog(retValue, "BackgroundTask error");
return;
}
System.Diagnostics.Debug.WriteLine("Navigating to HeartBeatPage");
this.Frame.Navigate(typeof(HeartBeatPage));
});
}
else
{
SetWaitVisibility(false);
ShowErrorDialog("Failed to connect to the device, reason : " + error, "Device Connection");
}
}
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
System.Diagnostics.Debug.WriteLine("OnNavigatedFrom");
//remove background task event handlers
BackgroundManager.UnRegisterBackgroundTaskEventHandlers(null, _progressEventHandler);
base.OnNavigatedFrom(e);
}
/*
* App to app launchn URI can be fetched with
* ProtocolActivatedEventArgs launchArgs = e.Parameter as ProtocolActivatedEventArgs;
* and we could do something about them if we would want to
*/
protected override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
SetWaitVisibility(true);
DeviceName.Text = AppSettings.SelectedDeviceName;
_data.Clear();
if (!BackgroundManager.RegisterBackgroundTaskEventHandlers(null, _progressEventHandler))
{
ShowErrorDialog("Plese go back and select device", "Device not selected");
return;
}
// todo : we should have timer here, that brings error note if we don't get data from background task in x seconds
}
private void NavigateToStarPage(Frame rootFrame, System.Object parameter)
{
//if we have already active background task, we can go strait viewing values from it
if (BackgroundManager.IsBackgroundTaskRegistered())
{
if (!rootFrame.Navigate(typeof(HeartBeatPage), parameter))
{
throw new Exception("Failed to create initial page");
}
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Visible;
}
else
{
if (!rootFrame.Navigate(typeof(MainPage), parameter))
{
throw new Exception("Failed to create initial page");
}
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = AppViewBackButtonVisibility.Collapsed;
}
}
private async void App_BackRequested(object sender, Windows.UI.Core.BackRequestedEventArgs e)
{
Frame rootFrame = Window.Current.Content as Frame;
if (rootFrame == null)
{
return;
}
if (rootFrame.SourcePageType.Equals(typeof(HeartBeatPage)))
{
if (BackgroundManager.IsBackgroundTaskRegistered())
{
e.Handled = true;
//Todo, consider movcing this to be handled inside the UI, not in external popup
// so we are going back from HeartBeatPage and we have active background task
// so we need to ask whether we want to keep it or not
var dlg = new MessageDialog("Stop Background heartbeat monitoring ?");
dlg.Commands.Add(new UICommand("Yes", null, "YES"));
dlg.Commands.Add(new UICommand("No", null, "NO"));
var op = await dlg.ShowAsync();
if ((string)op.Id == "YES")
{
BackgroundManager.UnregisterBackgroundTask();
if (rootFrame.CanGoBack)
{ // if we started with Mainpage, we'll just go back
rootFrame.GoBack();
}
else
{ //but if we started with Heartbeat page, we actually need to navigate to the mainpage
rootFrame.Navigate(typeof(MainPage));
}
}
else
{
// lets let the background task run, while UI goes out
Exit();
}
return;
}
else if (rootFrame.CanGoBack)
{//this would be error situation, where we went to HeartBeatPage without active background task
rootFrame.GoBack();
}
}
if (rootFrame.SourcePageType.Equals(typeof(MainPage)))
{
e.Handled = true;
// from mainview we simply exit
Exit();
return;
}
// if we are here, we should just go back if it is possible
if (rootFrame.CanGoBack && !e.Handled)
{
e.Handled = true;
rootFrame.GoBack();
}
}
